Machine for assembling spark plugs



Oct. 7p l924 LSLZZ H. RABEZZANA MACHINE FOR ASSEMBLING SPARK PLUGS FiledApril 17 i923 3 Sheets-Sheet 1 ...nil Y f gvwamtoz Oct. 7, 1924. H.RABEVZZANA MACHINE FOR ASSEMBLING SPARK PLUGS Filed April 17. 1922 5Sheets-Sheet 2 i 25 Z5 35 Zz 2/ 3f 22 (e Suva/nto@ foci. 1n 1924.'1,511,202

H. RABEZZANA MACHINE FOR ASSEMBLING SPARK PLUGS Filed April 17. 1922 ssheets-sneer WWII!! /lllll Patented ct., 7, i924.

UNITED STATES,

l,5ll,202

PATENT QFFICE..

HECTOR RABEZZANA, OF FLINT, MICHIGAN, ASSIGNOR IlO A-C SPAR-K PLUG- COM-PANY, OF FLINT, MICHIGAN, A. CORPORATION 0F MICHIGAN.

MACHINE FOR SSEMBLING' SPARK PLUGS.

application ined April 17, 1922. serial no. 553,605.

To all whom t may concern:

Be it known that I, HECTOR RABEZZANA, a subject of the King of Italy,and a resident of Flint, county of Genesee, and State of Michigan, haveinvented' certain new and useful Improvements in Machines for AssemblingSpark Plugs, of which the following is a full, clear, concise, and exactdescription, such as will enable others skilled in the art to which theinvention relates to make and use the same, reference being made thereinto the accompanying drawings, which form a part of this specification.

My invention relates to the assembling of the several parts whichcollectively form a spark plug, and the principal object there- `of isto provide `a machine having various of the characteristics of a pressoperated by air under pressure and by the use of which the parts whichconstitute a sparkcplug may be better and more expeditiously assembledthan has heretofore been the case.

My invention relates particularly to a machine or press designed toperform a Apreliminary assembling operation upon spark plugs of the typewherein the porcelain insulating member is held in pllace within themetallic shell of the plug by an inturned flange, thus providing asingle piece plug the insulating member of which oanno-t be removed fromthe shell. In such plugs lower and upper yieldable gaskets areinterposed between shoulders upon the insulating member fand a lowerledge in the shell, and between the inturned ange at the upper endthereof; and if the several meeting. surfaces at the joints thus formedare not in inti- A mate contact With one another when the holding flangevis turned. inward the turning in operation may vfail yto take -up theloosness atthe joints, with the result that the meeting surfe/ces at theseveral joints will not be pressed into proper contact and leakage ofgas past or through the joints islikely to develop when the plug is inuse.

. My invention, therefore, is designed to obviate this objectionablefeature by providing for the forcing of the insulating member downwardinto the casing of the plug thus compressing the lower gasket, .and forforcing the upper gasket into intimate contact with the upper shoulderof the insulator andadjacent inner wall of the shell cavity, as stepspreliminary to the turning inward of the holding flange onto the uppergasket by another machine; thus providing a .plan wherein the gasketsare fully compressed prior to the final step of turning the holdingflange inward |and in which such turning in operation is not relied uponat all to produce proper contact between the meeting surfaces at thegaskets and proper gas tight joints between the insulating member andthe shell or casing of the plug.

A further object of my invention is to provide la device for the purpose-above eX- plained wherein the mechanisms for subjecting the lower andupper gaskets to pressure are independent of one another, so that eachoperates independently of the other to compress the gasket which it isdesigned to compress; anda still further object of my invention is toprovide a device, machine or press wherein the pressure applied to thelower gasket may be made greater than the pressure applied -to the uppergasket in the preliminary assembling ofthe parts as hereinbeforeexplained.

With the above and other objects of invention in view, my inventionconsists in the improved spark plug assembling device illustrated in theaccompanying drawings and hereinafter described claimed; and in suchvariations and modilcations thereof, within the scope of the concludingclaims7 as will be obvious to those skilled in the art to which myinvention relates.

ing a part of this speciication Iand wherein the prefererd embodiment ofmyl invention is illustrated:

Figure ly is a view showing my invention in side elevation for the mostpart, but sectioned in various places in order to enable the invention.to -be better understood.

Figure 2 is a similar view showing my invention in elevation and as seen.from a position in Ifront thereof.

Figure 3 is a fragmentary view showing the toggle mechanism shown in Fiand 2 in its collapsed instead of straightened condition, as in said ires.

Figure 4 is a view s owing -the air cylinand inally In the drawingsaccompanying and formres 1 -27 with the upp ders of my invention partlyin plan and 'i partly in section, together with the valve for controllinthe flow of air into and out from said cylin ers.

Figure 5 is a view showing the valve aforesaid and parts'associaitedtherewith 1n side elevation for the most part, and as seen from aposition to the right of Figure 2.

Figure 6 is a perspective view showing a toggle link of my invention byitself.

Figure 7 is a view showing a toggle frame member of my vinvention byitself and in perspective.

`Figure 8 is la sectional view upon a cem tral plane showing a sparkplug such as my invention is designed to operate upon.

Referring now to the drawings wherein the same elements are identifiedby the same reference numerals wherever they appear in the severalviews, 10 designates a main frame whereby the various elements of themachine are properly supported relative to one another and which may beof any form suitable for that purpose; said frame having a flat portionat its upper end designed to receive and support a cylinder casting 11having two cylinders 12, 13 formed therein and within which pistons 14,15 move as air under pressure is admitted to and exhausted from thespaces below said piston; said pistons having rods or plungers 16, 17extending through holes provided in heads 18, 19 and which operate twooscillating levers which are both pivotally supported upon a rod orshaft 20 the ends of which are supported in pedestals 21 which rise fromthe upper end of the frame at the sides thereof, and extend above saidshaft and serve as supports for a transversely extending abutment rod22.

The reference numeral 23 designates a lower gasket compressing leverwhich is centrally disposed upon the shaft 20 and the left hand end ofwhich is acted upon and `pushed upward by the piston 15 and plunger 17,and which lever is returned by a spring 24 operatively connectedtherewith. The right hand end of this lever is pivotally connected at 25to a toggle link 26 which is shown separately in Figure 6; and the lowerend of this link is pivotally connected at er end of a link 28, thelower end of which is pivotally connected at 29 with the upper end of alower gasket compressing plunger 30; which plunger extends through apassage provided in an upper gasket compressing plunger 31 which isslidable in a suitable vertically arranged bearing 32 carried by theframe 10 of the machine. The links 26, 28 thus form a toggle which'whenstraightened as shown in Figures 1 and'2 places the machine in acondition such that u ward movement of the piston 15 as air un erpressure enters the cylinders 13 beneath the piston will force ftheplunger 30 downward and apply presf jacent the lower end thereof. Theplunger 30 is provided with a tubular floating pressure a plying member34 which will be describe in detail hereinafter, and which forms theimmediate insulator engaging member through which pressure is applied tothe insulator as hereinbefore explained'. The reference numeral 35designates an upper gasket compressing lever designed to vforce theplunger 31 downward to thereby compress the upper gasket -fZ- of thespark plug through an annular die 36 at the lower end of said plungerand which forms the immediate force applying member to said gasket; theleft hand end of said lever being forced upward by the plunger 16 as airunder pressure enters the cylinder 12 below the piston 14 therein, thelever being moved in a reverse direction by a spring 37, as will beunderstood. This lever 35 is bifurcated to provide, structurally, twolevers lying one upon each side of the lever 23, v

said parts being connected by a bridge portion 38; and the right handend of 4this lever (or ends, strictly speaking, taking its bifurcatedform into consideration) is pivot, ally connected at 39, 39 betweenpairs of ears 40 at the upper end of a toggle frame 41 (which in effectis a toggle link shown as of the same length as the link 26), and whichframe is shown separately in Figure 7. The lower end of this toggleframe is pivotally connected at 42, 42, with the upper ends of two links43, 43 which enter slots provided in said frame and the positions ofwhich are indicated by the numerall 44 in Figure 2, and which links lieone upon either side of the link 28 (and are shown as ofsubstantiallythe same length as said link 28) and the lower ends of these links arepivotally connected at 45, 45 with the outer plunger 31 through whichpressure is applied to the upper gasket -dof the spark plug operatedupon, as hereinbefore explained.

In View of the premises it will be seen thatkr the levers 23 and 35 areoperatively connected, respectively, 30 and 31, through two togglemechanisms with the plungers.

which are separate and independent of one another; from which it followsthat after a plug to be operated upon has been placed in the machine andthe toggles have been straightened, as shown in Figures 1 and 2, eachplunger is free to move independently of the other as air under pressureenters the cylinders 12, 13 and forces the pistons therein upward.Pressure is thus applied directly to the lower gasket a through theplunger 30 and the insulating member -b; and directly to the uppergasket -flthrough the plunger 31; and the fact that the former plungeris movable within and independently of the latter permits such movementof each plunger independently of the other as may be necessary tosubject each gasket to the pressure found necessary to properly compressthe same and form gas tight joints at each gasket.

As a matter of course the lower gasket is to a certain extent subjectedto compression communicated from the upper gasket to the upper shoulderof the. insulating member upon which it rests, and through said memberto the lower gasket. As will hereinafter appear, however, the pressureapplied to the upper gasket reaches its maximum slightly after the lowergasket has been fully compressed, and after the insulating member hascompleted its slight downward movement due to downward movement of the.inner plunger 30; so that the pressure applied to the upper gasket 'bydownward movement of the outer plunger 31 and which movement is slightlydelayed relative to downward movement of the inner plunger will havelittle further compressing effect upon the lower gasket. Furthermore.,the lower gasket is commonly made from asbesv tos fabric encased in orassociated with a distortion of the upper gasket as pressure 1s appliedthereto tends to limit the action of the outer'plunger to the uppergasket, with the result that little or no pressure due to suchouterplunger is communicated to the lower gasket; thus securing, as willbe appreciated, independent compressing actions at both the lower andthe upper gaskets. As a matter of practical importance, however, it isquite immaterial whether the lower gasket is regarded as compressedentirely by the inner plunger, or in part by the outer plunge-r; as,when the parts are properly adjusted so as to secure proper joints atthe two gaskets it is unimportant how or in what particular way thepressure necessary to that end is secured and applied to the gaskets.Also, and as will be appreciated, the operation of the device isindependent of the particular kind of gaskets employed; and gaskets ofother form than above referred to may be used in plugs assembled by theuse of my invention.

The toggle frame 41 is provided with bearings 46 at its lower end whichare oifset relative to the plane of the pivotal connections 39, 42 andwithin which a transversely extending rod 47 is supported; and 48, 48designate two toggle operating links the upper ends of which arepivotally connected with said rod, and the lower ends of which arepivotally connected with a transversely extending rod 49 supported atits ends in bearings carried by a. swinging frame 50, which in turn ispivotally supported at 51, 5l from the frame 10 of the machine. Thebearing for the right hand end of this rod 49 is in the form of a loosesleeve 52 having a passage through which a rod 53 extends; and the lowerend of this rod is connected with a foot operated lever 54 through alink 55, while the upper end of said rod 53 is connected with an arm 56where-by an oscillating valve which controls the How of air underpressure to and from the cylinders 12, 13 is operated. The rod 53 mayslide through the passage. aforesaid in the bearing 52; and 5Tdesignates a spring surrounding said rod and acting betwee-n the saidbearing member and an abut- V men-t 58 upon the rod; where-by the rodmay be moved further downward to thereby operate the air valve aforesaidafter the toggles have been straightened and moved into the positionsshown in Figures 1 and 2 through the links 48, 48; the movementl of thevalve during the straightening of the toggle links being insufficient toadmit air to the cylinders 12. 13, and the final movement thereof toadmit air to the cylindersl being permitted by the yielding action ofthe said spring 5T. Thereafter and after the pistons 14. 15 have movedupward and pressure has been applied to the gaskets as aforesaid thesprings 59, 59 extending between the links 48 and the abutment rod Q2will, when the treadle lever is released, act

to return the pedal and break the toggle connections and cause thetoggle mechanism to assume the position shown in Figure 3, upwardmovement of the pedal lever being limited by an abutment 60 upon the rodor otherwise as will be understood.

Then the toggle connections are straight ened as shown in Figures 1 and2 the links 28 and 43, 43 will be slightly past their dead centerpositions and will rest against a stop 61 on the frame 10, against whichthey arey held by the spring 57 as will be appreciated; in whichposition they remain while air is admitted to the cylinders 1Q, 13 by afurther downward movement of the I'Od 53 which operates an aircontrolling valve and lows that the toggle mechanism associatedwi-th thelever 35 and through which said lever is connected with the outerplunger 31 through said frame and links will be straightened by thedirectv action of the links 48 as they swing said frame inward and aboutthe pivotal connections 39 between it and the lever 35. During andsimultaneous with this straightening action the second toggle connectionbetween the lever 23 and the inner plunger 30 provided by the links 26,28, will be straightened by engagement between the free end of a setscrew 62 in threaded engagement with a bridge piece 63 of said lframeand which free end engages the upper end of the central connecting link28, which forms a part of said second mentioned toggle connection.

The upper ends of the links'28, 43, 43 as they move into their finalpositions -when the toggles are straightened engage the heads ofyieldable spring operated toggle breaking plungers 64'slidable inbearings upon the frame 10; from which. it follows that the springs 65associated vwith these plungers and which are vcompressed during suchystraightening movement will act to force the upper ends of 'said leversto the right, Figure 1, and break the toggles when the treadle lever 54is released r and the toggles are relieved from the holding-in action ofthe spring 57. Immediately after or simultaneously with such breakingaction the springs59 act to swing the frame 41 about the pivotalconnections .v 39, and the. toggle links26, 28 are positively broken bythe action of a screw 66 carried by the link 26 and the shank of whichits'looscly in a recess 67 in the bridge portion 63 of said toggleframe; thus breaking both ytoggle mechanisms and placing the 4partsinthe positions shown in Figure 3. The toggle breaking action is mademore, certain in ythe -embo'dimentof my invention illustrated by`tension springs 68, 68,'the upper ends of which are connected with theabutment'rod 22 and the, lower ends of which are connected with a crossbar 69-secured to'and moving with the outer plunger 3l.

'lhecylinder casting 11 is provided` with a vertically disposed -valveseat, and the reference numeral 70 designates an, oscillating disc valveoperating uponr said seat and with which the inner end of` an operatingshaft'71-is loperatively connected; the arm 56 hereinbefore mentionedbeing se cured to said sli-aft so as to communicate motion to the valve,as will be appreciated,

; and. the valve being enclosed by a hollow cover 72 to .thereby providea valve chest vwith a port77 leading into the cylinder 13 The valve has'below the piston 15 therein. an opening 78 leading into the recess 74 sothat air under pressure supplied through a pipe 79 to the yalve' chamber73 may,

the valve from the position shown and as the treadle lever 54 is fartherdepressed, flow from said chamber through said openingand through therecess 74 and passage 77 into the cylinder 13; while movement of thevalve in a contrary direction (clockwise in Figure 5) as the toggleconnections .are broken will place the cylinder in question incommunication with the atmosphere through said passage 77, the recessand an exhaust-port 8O and an exhaust pipe 81. -K The cylinders l2, 13are placed in communication with one another through a lport 82 ofcomparatively, small area; from which it follows that upward-movement ofthe piston 14 may be delayed, slightly, relative to the'piston 15; asthe air to force said piston 14 upward must enter the cylupon slightfurther opening movement of inder 12 from the cylinder 13 through therestricted passage 82. The piston 15, however, will start up promptly asair is admitted to the cylinder 13; from which it follows that the`inner plunger 30 which is operated by the piston 15 may be moveddownward to compress the-lower gasket of the plug slightly before theouter plunger 31 is -moved downwardly by the piston 14 into engagementwith the upper gasket, as A having an upwardly extending centering anddischarging member 487 the upper end of which is shaped to conform tothe lower end pfl the insulating member of the plug. This supportingmember acts (be- `fore the toggles are straightened) to support the plugwith the enlarged central wrench receiving portion of the shell thereofslightly above the anvil 33, and acts to centerV the lower end of theinsulating member relative to the yshell and the shell re1- ative to theabutment 33, and to guide the insulator properly as it is forcedslightly downward within the shell; the spring yielding freely to thesuperior force of the plunger 30, but acting as a discharge member tolift the plug up from the anvil to a slight extent when the togglemechanisms are broken, and the plungers move up and away from the plugand into the position in which they are shown in Figure 3.

The inner plunger 30 as explained has a floating plunger 34, the upperend of which abuts at SS against an internal shoulder of the plunger 30,and is held in place by a holding ring 89; said plunger being shaped atits lower end to lit the upper end of the insulating member -Z)- of theplug operated upon and the same being yieldably held in ay centralposition by a spring 90 the upper end of which enters a central passagein the plunger 30 and the lower end of which enters a similar passage inthe lioating plunger 3l.

From the above it follows that initial contact between the lower end ofthe ioating'plunger 34C and the upper end of the centering member 87 andthe ends of the insulating member with which said members engage acts tocenter the insulating` member relative to the plunger-s 30 and 84, andto center the shell relative to the anvil 325; as the plug as a whole isthen supported l upon the spring 8G and the upper` end of the floatingplunger Bel is free to move sidewise. Further downward movement of saidplungers 30 and 84 will move the shell downward and onto the seatingsurface at the upper end of the anvil 33, after which the upper andlower gaskets of the plug are compressed as hereinbefore explained.

Having thus described and explained my invention, I claim and desire tosecure by Letters Patent:

1. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms intermediate said plungers and said levers, an'dthrough which said plungers are operated each independently of theother; means for simultaneously breaking and straightening said twotoggle mechanisms; and means for operating said levers to therebycommunicate movement to said plungers through said toggle mechanisms.

2. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connected onewith each of said plungers, and the upper ends of which are pivotallyconnected one with each of said levers; means for simultaneouslybreaking and straightening said two toggle mechanisms; means operated byair under pressure for operating said plunger operating levers; andmeans for controlling the flow of air under pressure to and from saidoperating means.

3. In a device of the class described, two concentrically arrangedplungers; two pivotally supported operating levers; two togglemechanisms the lower ends of which are pivotally connect-ed one witheach of said plungers, and the upper ends of which are pivotallyconnected one with each of said levers; means for simultaneouslybreaking and straightening said two toggle mechanisms; means operated byair under pressure for'operating said plunger operating levers; andmeans operated by said toggle operating means for controlling4 the flowof air under pressure to and from said operating means.

4. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connected onewith each of said plungers, and the upper ends of which are pivotallyconnected one with each of said levers; a foot operated leveroperatively connected with both said toggle mechanisms to therebysimultaneously break and straighten the same; means operated by airunder pressure for operating said plunger operating levers; means forcontrolling the flow of air under pressure to and from said air operatedmeans; and means operated by said foot operated lever for operating saidair flow controlling means to thereby control the flow of air underpressure to and from said air operated means.

5. In a device of the class described; two concentricallyv arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connected onewith each of said plungers, and the upper ends of which are pivotallyconnected one with each of said levers; link mechanism through whichsaid toggle mechanisms may be simultaneously broken and straightened; afoot operated lever operatively connected with said link mechanism;means operated by air `under pressure for operating said plungeroperating levers; a valve for controlling the flow of air under pressureto and from said air operated means; and a connection between said footoperated lever and said valve and through which said valve is operated.

6. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connected onewith each of said plungers, and the upper ends of which are pivotallyconnected one with each of said levers; means operated by air underpressure for operating said plunger operating levers; a valve forcontrolling straightening saidtwo toggle mechanisms;

and link mechanism operated by said footoperated lever and adapted tooperate said breaking and straightening means.

7. In a device of the class described, two concentrically arrangedreciprocating plungers; the movements of which occur in .unison, and inthe same direction along thelr common axis; two pivotally supportedoperating levers; two cylinders having leach a piston operating therein,and which pistons are operatively connected one with each of saidlevers; a valve adapted to control the flow of air under pressure to andfrom said cylinders; and mechanism through which movement of said leversis communicated to said plungers. l

8. In a device of the class described, two reciprocating plungers; twopivotally supported operating levers; two cylinders having each a pistonoperating therein, and which pistons are operatively connected one witheach of said levers; a valve adapted to control the flow of air underpressure to and from saidcylinders; two toggle mechanisms intermediatesaid levers and said plungers and through which said plungers arcoperat: ed from said levers; means whereby one of said toggle mechanismsmay be broken and straightened; and means operated by said breaking andstrai htening means for breaking and straightening the other of saidtoggle mechanisms.

9. In a device of the class described, two reciprocating plungers; twopivotally supported operating levers; two cylinders hav- `ing each apiston operating therein, and

which pistons are operatively connected one with each oi said levers; avalve adapted to control the flow of air under pressureto and from oneof said cylinders; a passage through which said cylinders are placed incommunication with one another; and mechanism through which movement ofsaid levers is communicated to said plungers.

10i. In a device of the class described, two concentricallyl arrangedreciprocating plun- Y gers; two pivotally supported operating levers;two cylinders having each a piston operating therein, and which pistonsare operatively connected one with each of said plungers; a passagethrough-.which said cylinders are placed in communication one with theother; a'y valve for-controlling the ow of air under pressure into andout from one of said cylinders; and afoot operated lever operativelyconnected witl said valve to operate the same.

11. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally supported operating levers ofdifferent lengths;Y two cylinders having each a piston operatingtherein, and which pistons are operatively associated one with each ofsaid levers;'a passage through which said cylinders are placed incommunication one with the other; a valve for controlling the flow ofair under pressure into and out from one of said cylinders; and meansthrough which each of said levers Ycommunicates motion to one only ofsaid plungers, so that each plunger is free to operate independently ofthe other.

12. In a device of the class described, two concentrically arrangedreciprocating plungers; two pivotally su ported operating levers ofdifferent lengt s; two cylinders having each a piston operating.therein, and which pistons are operatively associated one with each ofsaid levers; a valve for controlling the How of air under pressure toand from said cylinders; and means through which each of said leverscommunicates motion to one only of said plungers, so that each plungeris free to operate independently of the other.

13. In a device of the class described, two cylinders in communicationwith Vone another; two pistons operating one in each of said cylinders;a valve adapted to control the iow of air under pressure into and outfrom one of said cylinders; a foot operated lever for operating saidvalve; two concentrically arranged reciprocating adapted to operate upona spark p ug, and which plungers are operated independently of oneanother one by one and the other by the other of said pistons; and meansthrough which said plungers are operated asv aforesaid, one from each ofsaid pistons.

.14. In a device of the class described, two concentrically arrangedreciprocating plungers adapted to operate upon a spark plug; twopivotally supported operating levers for said plungers; two togglemechanisms the lower ends of which are pivotally connected one with eachJof said plungers, and' the upper ends of which are pivotally connectedone with each of said levers; means for simultaneously breaking andstraightening said toggle mechanisms; spring operated plungersplungermechanism engaging said toggle mechanisms to assist in thebreaking thereof; means operated by air under pressure for operatingsaid plunger operated levers; and means for controlling the iow of airunder pressure to and from said air operated means. l

15. In a device of the class described; two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanismsl the lower ends of which are pivotally connected onewith each of said plungers and the upper ends of which are pivotallyconnected one with each of said levers; means for simultaneouslybreaking and straightening said toggle mechanisms; spring operatedplunger mechanism engaging said toggle mechanisms to assist in thebreaking thereof; and means for operating said levers to thereby operatesaid plungers through said toggle mechanisms.

16. In a device of the class described, two concentrically arrangedreciprocating plungers adapted to operate upon a spark plug; twopivotally supported operating levers for said plungers; two togglemechanisms the lower ends ot which are pivotally connected one with eachot' said plungers, and the, upper ends of which are pivotally connectedone with each of said levers: link mechanism operatively connected withone of said toggle mechanisms and adapted to break and straighten thesame; means whereby the other toggle mechanism is operated from saidlink operated toggle mechanism; a foot operated lever operativelyconnected with said link mechanism.; air operated means for operatingsaid plunger operating levers; a valve for controlling the flow of airunder pressure to and from said air operating means: and means wherebysaid valve is operated by said foot operated lever.

17. In a device of the class described; two concentrically arrangedreciprocating plungers; two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connected onewith each of said plungers, and the upper ends of which are pivotally7connected one with each of said levers: link mechanisms operativelyconnected with one of said toggle mechanisms and adapted to break andstraighten the same: means whereby the other toggle mechanism isoperated from said link operated toggle mechanism; a toot operated leveroperatively connected with said link mechanism; and means controlled bysaid :toot operated lever for operating said rst mentioned levers.

18. In a device of the class described, two concentrically arrangedreciprocating plungers movable in unison to and fro along their commonaxis, and which plungers are adapted to operate independently of oneanother upon a spark plug; two pivotally supported levers independent ofone another and which levers are operatively connected one with each ofsaid plungers; two cylinders; two pistons located one within each ofsaid cylinders, andwhich pistons are operatively connected one with eachof said levers; a valve adapted to control the flow of air underpressure to and from said cylinders; and means for operating said valve.

19. In a device of the class described, two concentrically arrangedreciprocating plungers adapted to operate independently of one anotherupon a spark plug; two pivot-- ally supported operating levers for saidplungers; two cylinders; two pistons operating one within each of saidcylinders, and which pistons-are operatively connected one with each ot'said levers; a valve for controlling the flow of air under pressure toand from one of said cylinders; two toggle mechanisms separate andindependent' ot one another and the lower ends ot which are pivotallyconnected one with each of said plungers, and the upper ends of whichare, pivotally connected one with each of said levers; and a footoperated lever operatively connected with said valve and with the saidtoggle mechanisms and whereby said toggle mechanisms and said valve areoperated.

20. In a device ot the class described .two concentric-ally arrangedreciprocating plungers: two pivotally supported operating levers; twotoggle mechanisms the lower ends of which are pivotally connect-ed onewith each of said plungers. and the upper ends of which are operativelyconnected one with each of said levers; two cylinders; two pistonsoperating one within each of said cylinders. and which pistons areoperatively associated one with each of said levers; a valve forcontrolling the flow of air under pressure to and from said cylinders;link mechanism operatively connected with said toggle mechanisms tosimultaneously break and straighten said mechanisms; a foot op-v eratedlever; a. valve operating rod intermediate said foot operated lever andthe. valve aforesaid; and a spring associated with said valve operatingrod and through which said link mechanism is operated from said rod.

2l. In a device of the class described, two concentrically arrangedreciprocating plungers; vtwo pivotally supported operating levers; twotoggle mechanisms the lower ends ot which are pivotally connected onewith each of said plungers and the upper ends of which are operativelyconnected one with each ot' said levers; means foreperating said leversto thereby communicate movement to said plungers through said togglemechanisms; link mechanism operatively connect-ed with said togglemechanisms to simultaneously break and straighten said mechanisms; atoot operated lever; an operatingV rod intermediate said foot oper--ated lever and the operating means aforesaid for said first mentionedlevers; and a spring associated with said operating rod and throughwhich said link mechanism is operated from said rod.

22. In a device for operating upon spark plugs, an annular anvil adaptedtoreceive and support the shell of a plug; a spr-ing pressed plungerconcentric with said anvil and having a support arranged to engage thelower end of the insulating member of the plug; a reciprocating plungerthe lower end of which is adapted to engage the upper end of theinsulating member aforesaid; and means for operating said last mentionedplunger.

23. In a device forK operating upon spark plugs, a hollow supportingsleeve; an'annular anvil supported by said sleeve and adapted to receiveandfsupport the shell of a plug; a recip-rocating plunger operatinglwithin said sleeve and having an upwardly extending portion arranged toengage the lower end of the insulating member of the plug; a springacting upwardly upon said plunger; a reciprocating plunger the lower endof which is adapted to'engage the upper end of the insulating memberaforesaid; and means for operating said last mentioned plunger.

24. In a device for operating upon spark plugs, a hollow supportingsleeve; an annular anvil supported by said sleeve and adapted to receiveand suppor'tvthe shell of a plug; a hollow reciprocating plungeroperating within said sleeve, and having an upwardly extending portionarranged to engage the lower end of the insulating member of the plug; aspring arranged within said plunger and acting upwardly thereupon; areciprocating plunger'the lower end of which is adapted to engage theupper end of the insulating member aforesaid;

and means ,for operating said last mentioned plunger.

25. In a device for operating upon spark plugs, an annular anvil adaptedto receive and support the shell of the plug; a spring pressed plungerconcentric with said anvil and having a support arranged to engage y thelower end of the insulating member of the plug; a reciprocating plungerand means for operating the same; an auxiliary plunger carried by saidreciprocating plunger and free to move laterally relative thereto,andthe lower end of which is adapted to engage the upper end of theinsulating member aforesaid; and a spring between said reciprocating andauxiliary plungers and adapted to hold said auxiliary plunger in anormally'central position.

27. In a device for operating upon spark plugs, an annular anvil adaptedto receive and support the shell of a plug; a reciproeating plunger andmeans for operating the same; an auxiliary plunger carried by saidreciprocating plunger and movable laterally relative thereto, and thelower end of which is adapted to engage the upper end of the insulatingmember aforesaid; and a spring associated with said reciprocating andauxilia 'plungers and adapted to hold said auxi iary lunger a normallycentral position. J f f In testimony whereof I aix my signature.

HECTOR RABEZZANA.

